Ami,
The Metal Halide makes a Blue light much like the sun in mid-summer. Red/Yellow light is much more like what you will see near the beginning and end of the year when the sun rides lower in the sky. I have heard it said that the blue light is better for vegative growth and Red/Yellow is better for Flowering and Fruiting as you said, however, seeds start early in the season so I would assume they would have adapted to Red/Yellow Vs Blue.
Greg
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